Here you go: https://forum.xfce.org/viewtopic.php?id=12114
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Some search results suggest going to Settings -> Window Manager Tweaks -> Accessibility and disabling the option for tiling windows when moved toward the screen edge.
Settings > Window Manager Tweaks > Accesibility tab > Automatically tile windows when moving toward the screen edge
EDIT: Oops, someone already gave the answer.
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